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%% This file is part of the book
%%
%% Algorithmic Graph Theory
%% http://code.google.com/p/graph-theory-algorithms-book/
%%
%% Copyright (C) 2009--2011 Minh Van Nguyen <nguyenminh2@gmail.com>
%%
%% See the file COPYING for copying conditions.
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\begin{tabular}{c|ccc}
$\delta$ & $a$         & $b$         & $c$ \\\hline
$1$      & $\{1, 2\}$  & $\emptyset$ & $\{3\}$ \\[4pt]
$2$      & $\emptyset$ & $\{2\}$     & $\{3\}$ \\[4pt]
$3$      & $\emptyset$ & $\emptyset$ & $\emptyset$
\end{tabular}
